Sawmill dog



- Se t. 1,641,900 p 1927 w. NEWSOM SAWMILL DOG Filed Ju n e 5, 1926 2 Sheets-Sheet l mmll wizard Me a/60m Sept. 6,1927.

w. NEWI-SOM 'SAWM-ILL no G.

Filed June 5, 1926 2 Sheets-Sheet 2 7f l /amd'fl waom is i attozucq Patented Sept. 6, 1927.

UNITED STATES PATENT'OFFICEQ WILLARD NEWSOM, or MONTGOMERY, AL BAMA.

SAWMILL DOG.

Application filed June 3, 1926. Serial No. 113,499.-

15 will be hereinafter more fully described,

the features of'novelty being pointed out particularly in the claims at the end of the specification.

In the accompanying drawings Figure 1 is a side view of a portion of a saw mill set works showing a dog constructed in accordance with the present invention mounted on one of the knees there- Figure 2'is a' front view',partly in section,

showing'the dog removed from the knee;

Figure 3 represents a. sectlon'through the dog-actuating means taken on the line 33 m of Figure" 2;

' but showing the operating handle applied in a different position from that shown in Figure 3; I

Figure 5 is a detail top plan view of the dog-carrying slide, its supporting bar being shown in section; I

Figure 6 is a side elevation of the dogcarrying slide'and a. portion of its supportingbar; v

Figure 7 is a view' similar to Figure 5 showing anotherform of dog-carrying slide that may be used; and I Figure 8 is a side elevation of theslide shown in Figure 7-.

referencecharacters in thediffe'r'ent figures.

Saw mill dogs embodying the present inventiou' may be applied to orused in connection with saw mills of different kinds, theyrbeing adapted to be secured to the appropriate sides of the knees of the head blocks so that the dog bits may engage the log and secure it onthe carriage in proper position to be operated upon by the saw. The preferred embodiment ofthe invention Figure 4 is a view similar to Figure 3,

Similar parts are designated by the same is shown in the accompanying drawings and -will be hereinafter described in detail, but

it is to be understood that the invention is not restricted to the precise constructio'm shown as equivalent constructions are contemplated, and such will be included within a the scope of the claims. I I

.In the present instance, 1 represents a portion of a head block of the reciprocatory carriage of a saw mill, andQ'represents a portion of, one, of the knees, a pair of these knees being usually employed and provided with means for adjusting them transversely of the carriage to advance the log marked X for the successiveccuts therethrough by the saw as the log rests on and is reciprocated longitudinally with the carriage.

The dogs, one of which is provided for each knee, serve to secure the log in position on the carriage. Each-dog comprises usually one or two bits which grip and hold the log in position on the carriage during the sawing operation, and when the sawing operation on a log hasbeen completed, the dog bit-or bits-must be released from the remainingportion of that log, and after another log has been placed upon the carriage, the bit or bits are re-adjusted according to the size'and shfape'of the new log and are then actuated to grip and secure the log onthe carriage.. The present invention provides a dog mechanism which enables the dog'bits to be adjusted and operated .quickly and with facility in the performance of these operations.

Preferably, and as shown, each dog com} prises a rigid bracket 3 which has a Ver tical portion'ad'apted to fit against and to be bolted or otherwise secured to a side of the knee, and this bracket serves to guide and support a'bar at which is movable vertically therein, and servesto actuate the dog bits.

As shown, the lower end of the bracket 3 has a laterally turned portion-5 which forms a foot, and this portion of the bracket has an opening therein through which the lower end of the'bar' 4 extends and in which it may reciprocate vertically. The upper portion of the bracket has lateral projecting portions 6 and 7 which are spaced apart vertically and have aimed openings therein through which theupper portion of the'bar 4 extends and in which it may reciprocate vertically. The'bar 4 may be circular in cross-section as shown or it maybe angular ill iii

or otherwise shaped in cross-section, and it may be hollow, if desired, or solid, as shown. The bar formed with a slot 8 which is arranged preferably diametrically thereof and extends from the lower end to a point near the top of the bar, this slot being of a width to receive the body of a dog bit 9, the point 10 of which is adapted to grip or engage the log.

A slide 11 is fitted on the bar at so that it may be adjusted vertically thereon. The body of the dog bit 9 extends tri'insversely through this slide and through the slot in the upright bar, and it is movable therein, so that the dog may he set at diti'erentdisanees from the front of the knee. The slide shown in Figures 1, Q, 5 and 6 is formed. in one piece and surrounds the bar 4:, and it is split at one side by slotting it, as indicated at 12, so that the slide may be contraeted to grip and secure it immovabl on the bar l and to grip and in'nnovably secure the dogbit 9 therein. the slide preferably having a normal tendency to expand and thus release its grip on the bar it and on the body of the dog bit 9 so that the slide may be adjusted vertically on the bar i and the dog bit may be adjusted so that it may projet-l more or less in front ofthe knee. Means is provided for contracting the slide so that it will be secured on the bar st and will immovably secure the dog hit 9, at one opera tion, and the slide may be released for adjustment on the bar -'l and the dog bit 9 may be released for adjustment in the slide, by another single operation. As shown in Figures 1, 2, 5 and (3, such means comprises a. lever 13 having a shank it which extends loosely through a hole .15 formed in one side of the slide and threaded into a hole 16 in the opposite side of the slide, the lever being formed or provided with a collar or shoulder ii to exert compression against the adjacent side of the slide when the lever is swung in a direction to draw the threaded end of the shank l -l into the threaded side of the slide. One or more washers 18 of suitable thicrness may be interposed be tween the shoulder 17 and the adjacent side of the slide to compensate for wear and to insure a given setting of the lever 13 when in looking position. This lever is preferably adjusted that it will occupy a lower position than shown in Fig. 1, when the slide is clamped or locked to the bar at, and the body of the dog bit 9 is clamped or locked by the slide by the contraction or drawing together of the opposite sides of the slide under the action of the threaded shank of the lever, and a weight 19, which may also serve as a handle, is preferably in its eontracti-zd or clamping condition, although lifting of the lever 13 into an approximately vertical position will release the compression upon the slide, so that it may expand and thus permit adjustment of the slide on the bar l and also adjustment of the dog bit in the slide. In Figures 1 and t3 the rightdiand dog is shown, the shank of the clamping lever being provided with a right-hand thread in order that the lever may swing downwardly and toward the rear of the knee in assuming clamping or locking position. The lel'tduuid dog for the knee may use a siinilar lever except its shank is preferably provided with a lefthand thread to engage in a similar thread which will be formed in the opposite side of the slide from that shown in Figi'ires 5 and 6 so that the clamping lever may occupy a position at the opposite side of the slide for the leftdiand dog and it may swing downwardly and to and the rear of the knee in assuming its clamping or locking position. The slide is preferably formed or provided with ribs 20 which project laterally therefrom and are arranged to bear against the vertical portion of the bracket 3 in the event that the bar -l bends toward this bracket under strain imposed thereon, thereby enabling the bracket to reinforce the bar in resisting such strains. These ribs may be formed in pairs at opposite sides of the slide so that one or the other of these pairs of ribs will be in position to bear against the bracket, whether the slide is used on the right-hand or the left-hand dog of the knee, thus enabling one form of slide to be used for both of the dogs. Instead of eonstructiug the slide as shown in Figures 1,2, 5 and t3, the slide may be constructed as shown in Figures 7 and 8. In this instance, the slide 11* is slotted diametrically across the top thereof so that its upper portion may be compressed and thereby contracted to grip the bar l and also the body of the dog bit 9. In this instance, the upper portion of the slide at opposite sides of the bar el is provided with hugs the lugs at one side of the slide and having openings 21 there through to receive a bolt 22, and the lugs at the opposite side of the slide are provided with a threaded opening, 16 and a relatively larger unthreaded opening 15. A clamping or locking lever 13 is provided which has a cross-bar at one end which forms a pair of oppositely extending shanks having a righthand thread ll" on one shank and a left hand thread it" on the other shank.

The slide shown in Figure T is intended for the right-hand dog of the knee. and to bring the lever f3 at the desired side of the dog and arrange this lever so that it will swing dmvnwardly and to "ard the rear of the knee in clainpii'ig or looking the slide, the right-hand thread 1 s on the lever 13 til) ill)

Hill

\ a washer 18 may be interposed between this shoulder andthe adjacent side ofthe slide to compensate for wear and to bring the lever 13 into the proper position when the slide is in clamped or lockedcondition. The

, mode of operation of this form of slide. is

similarto that shown in Figures 5 and 6, the slide being relatively contracted to grip the bar 4 and, therefore, immovably lock the slide thereon and to grip and immovably secure the body of the dog bit 9 when the lever 13 is swung downwardly and toward the rear of the knee; and when the lever 13 is swung toward or into an upright position, the compression on the slide is relieved so that the slide maybe adjusted vertically on the bar 4 and the dog 9 may be adjusted in a forward and rearward direction in the slide. The bolt 22 may have a nut 22? threaded thereon, and this bolt and nut may be utilized as a means of adjustment'which will control the amount of compression exerted on. the clamp and the position occupied by the lever 13 when in clamping or locking position. -Inusing a slide of this kind on the left-hand dog, the shank of the lever 13 which bears the left-hand thread 14 is threaded into the relatively opposite side of the slide for the left-hand bracket in order that the lever 13? may occupy a position at the proper side of the left-hand dog. This arrangement enables a substantially duplicate construction to'be used for the right-hand and left-hand slide and clamping lever. Also, the slide when constructed as-just described, may be formed vonits opposite sides with ribs 20 to engage the respective bracket 3, and thus sustainbending strain exerted on thebar 4.

The retraction of the dog 9 .from 'one log and its engagement with another log are effected by upward-or downward movements respectively of the bar 4 relatively to its guiding and supporting bracket 3. The

meansfor actuating the bar 4 comprises preferably a cam 23 which is-arranged to act on the upper or lower lateral extension 6 or 7 of the bracket and is connected to the bar 4 so that the action of the cam will be to raise or lower withthe bar. :The'cam is preferably in-the form of an" eccentric,-as shown, 'it-having a circular periphery and engaging the portions 6 and 7 of the bracket at diametrically-opposite points. The cam is preferably mounted rotatably on a sleeve or bushing 24, and a disk 25 which is preferably form'ed'separately from the cam is also mounted 'rotatably on thisbushing, the

lever 30 in a direction to force the dog into bushing being clamped rigidly against a bar 4 by a bolt 26 which extends through the bar and the bushing and isprovided with a removable clamping nut 27. The sideof the bar'4 towhichthe cam and disk are applied W is preferably formed with a recess 28 which provides a bearing or socket in which the disk 25 may rotate, the disk 25 being thus adapted to transfer the force exerted by the cam 23 to the bar 4. By constructing. the cam 23 and the disk 25 as separateparts, repair or renewal of either of these parts may be effected inexpensively. However, the cam and'disk arepreferably connected so that they will rotate in unison when in operative'position by forming ribs 29 on one of the parts, such, foreX-ample, as the disk and recesses 29 in the other part to receive these ribs, the ribs and recesses being arranged radially or diametrically of the parts The disk and'cam are'held in coupled relation by the bolt 26, although they may be readily removed for *repair or replacement after the bolt 26 has been removed The cam is rotated by a lever 30 which has an opening 31 therein to fit around the outer end of the bushing 24, the nut 27 on the bolt 26 serving to hold this lever and also the cam 23 and disk 25 in place on the bushing, and a screw 32 which extendsthrough the lever 30 and is threadedinto the disk 23 serves to secure the lever 30 in fixed position against the side of the cam. so that swinging movement of the lever 30 will take place about the bolt 26 as a center'and the cam23 anddisk25 will rotate in unisontherewi'th. V V

The cam 23 and the portions 6 and 7 of the bracket 3 areso' proportioned and arranged that when the lever 30 is in a lower position than shown in Figure 2, the dog 9 will be lowered into gripping engagement with the log on the carriage, and when the lever is swung upwardly toward or into an upright position, the bar 4 and thedog carrjied thereby will be raised and thus released from the log. The outer or free end of the lever 30 is preferably provided with a weight 33 which will normally tend to swing the engagement withthe log and to retainit in gripping engagement therewith, this weight serving conveniently as a handle for operating-the lever. r

It :is generally preferable to provide a lower dog togrip and secure the bottom of the log in c'onjunction'with the'dog 9 which engages the top or upper portion of the log as the log :is then held more securely against displacement on the carriage. Alower dog 34 is shown in the present instance, and this dog, according to the present invention, is operated automatically or concurrently with 1 themovements of the upper dog'9to simultaneously release the log-or move into entill gagemcnt therewith. As shown, this dog is pivoted on a bolt 35 which is supported from a bracket so which is secured to and extends downwardly from the foot 5 of the bracket 3. The shank of the lower dog in rear of the pivotbolt 35 is formed with a longitudinal slot 37, and a pin or bolt 38 is extended through the lower portion of the bar 4 and through the slot 37 in this lower dog. These parts are so arranged relatively to the cam that when the cam is in locking position the pin or bolt 38 will be lowered to the point where it swings the forward end or point of the lower dog into gripping engagement with the under side of the log, this lower dog being shown in this position by the i'ull lines in Figure l; and when the cam s rotated into releasing position the lower dog will be swung, by reason oi its engagement with the pin or bolt 38, into the dotted line position shown in Figure 1, thereby releasing this dog from the log. Thus, the lower dog is caused to automatically move into gripping engagement with the log concurrently with the corresponding movement of the upper dog and it is retracted from the log concurrently with the retraction of the other dog.

The cam 22 disk and lever 30 may be placed at the front oi the bar -l as shown in Fig. 3, this position being desirable when the sawyer sets his own blocks, or these parts may be placed at a side of the bar so that the lever extends to the rear of the carriage as shown in Fig. i, this position of the lever being desirable when the operator rides on the carriage, the cam in either case acting on the portions (3 and 7 of the bracket 3. The cam, disk and lever may be oi duplicate form for the right-hand and left-hand dogs.

By providing a split slide having a single or common means for concurrently contracting and thereby locking it on its upright supporting bar and locking the dog bit in set position, the dog bit is held with great firmness by the slide and the slide is very secure. y locked against movement: on the upright bar, although the operation of locking the dog and slide and also the operation or unlocking these parts may be performed quickly and with facility.

By providing a lower dog bit to cooperate with the upper bit and connecting these bits by the upright bar so that they will operate simultaneously to grip and release a log, the log locking and releasing operations may be performed quickly by manipulation of. a single or common operating member.

The dog actuating means provided by the present invention is simple and inexpensive in its construction and it is capable of act ing positively to retract the dogs from the log and of acting positively and wlth great force to engage them with the log and hold them securely in engagement therewith against the reaction :trom the dogs, thereby insuring iirin holding of the log immovably on the saw mill carriage.

The construction of all of the parts of the dog is such that duplicate parts may be used for the rightand left-hand dogs, thereby facilitating and rendering less expensive the construction and maintenance of the dogs.

By extending the shank of the upper dog bit through a dianu trieal slot in its upright supporting bar, the strain exerted on the dog will act centrally of this bar, thereby niinin'iizing tendency to bend or deflect the bar, and the shank oi the dog bit will prevent closing of the slot in the bar under the compression exerted upon its exterior by the split slide when the latter is clamped or contracted, thereby insuring secure locking of the slide on the bar and also firm locking of the dog by the slide. The engagement oi the dog bit in the slot in the upright bar also prevents undesirable rotation of the slide on the bar.

By providing a cam and cooperative disk to effect the reciprocation of the bar to engage and disengage the dog bit or bits with respect to the log, the movements of the bars oi the rightand lett-hand dogs will be uniform tor a given angular movement of the levers connected thereto and, moreover, this construction enables the operating lovers to be placed at any desired side of the bar, according to whether the logs are to be set by an operator riding on the saw mill carriage or by the sawycr and to enable the operating levers to be placed in the desired positions on the rightand left hand dogs.

I claim as my invention 1. A saw mill dog comprising a supporting bar having a slot therein, a split slide thereon, a dog bit engaged by the slide and having its body extended into the slot in said bar, and means for contracting the slide tocause it to grip the supporting bar and to grip and hold the dog bit.

A saw mill dog coni 'irising a supporting bar having a vertical slot therein, a slide embracing and movable vertically on said bar, a dog bit carried by the slide and having a portion thereof extending through the slot in the bar, and means operative to clamp together the bar and slide.

3. A saw mill dog comprising a supporting bar, a slide movable, thereon and formed with a slot which permits the slide to expand and contract relatively to said bar, a dog bit carried by said slide, and means to contract the slide and thereby cause it to grip said bar con'iprising a weighted lever having a shank which has a thrust engage ment with the slide at one side of the slide and a thread engagement with the slide at IUU the opposite side of the slot, the weight of the lever acting to operate it to contract the slide on said bar.

4. A saw mill dog comprising a supporting bracket, a bar mounted thereon, and a dog slide on said bar, said bracket having a portion which extends in parallelism with said bar, and the slide having portions thereon arranged to engagesaid portion of the bracket and thereby resist bending of said bar.

5. A saw mill dog comprising a support ing bar having a slot extending vertically therein, a slide movable vertically on the exterior of said bar, and a dog bit carried by the slide and having a portion thereon extending into said slot in the bar.

6. A saw mill dog comprising a reciprocatory bar having a slot formed diametrically in its lower end, a slide mounted thereon and carrying a dog bit movable by the reciprocation of said bar into and out of operative position, and a second dog bit fitted into said slot in the lower end of thereciprocatory bar and operatively connected to said bar and movable by the reciprocation thereof into and out of operative position.

7. A saw mill dog comprising a supporting bracket, a bar reciprocable with respect thereto and having a slot extending upwardly from its lower end, aslide carried by said bar and having a dog bit thereon which ex- 7 tends through the upper portion of the slot in said bar, and a second dog bit pivotally mounted on said bracket and arranged in the lower portion of the slot in and opera tively connected to said bar whereby reciprocation of the latter causes said dog bits to move concurrently into and out of operative position. 7

8. A saw mill dog comprising a supporting bracket having opposed portions longitudinally spaced thereon, a bar reciprocatory longitudinally said bracket and carrying a dog bit, and a cam arranged to bear on said opposed portions of the bracket and 0-pcrative in a plane parallel to the length of said bar to reciprocate it.

9. A saw mill dog comprising a supporting bracket having portions projecting laterally therefrom, a dog carrying bar reciprocable with respect to said bracket, a cam arranged to bear on said laterally projecting portions of the bracket, a disk connected to rotate with said cam and having a bearing in a side of said bar, and means for pivotally connecting said cam and disk to said bar.

10. A saw mill dog comprising a supporting bracket having portions projecting laterally therefrom, a dog actuating bar guided to reciprocate with respect to said bracket and having a circular bearing recess formed in a side thereof, a disk seated to rotate in saidrecess, a cam connected to rotate with said disk and operative between said laterally projecting portions of the bracket to reciprocate said bar, a bushing on which said cam and disk are rotatable, and means for securing said bushing to said bar.

11. A saw mill dog comprising a supporting bar having a slot extending vertically therein, a slide movable vertically on the exterior of said bar, a dog bit carried by the slide and having a portion thereof extending through said slot in the bar, and means operative to clamp the dog bit, the slide and the bar against relative movement.

In testimony whereof I have hereunto set my hand. c

WILLARD NEWSOM. 

